Set-Up 2 WANs (one is dynamic, other is static) in one router?

Hello, i just purchased a Mikrotik Routerboard (HEXs). Because i am a home router user and i am seeing RouterOS settings are just beyond my understandings about setting routers. Spent the whole day setting up the router and no success, almost giving up, i read forum topics matching keywords like “multiple ISP” etc. and still don’t know how to do it, please help.
My situation is the following: I have 2 different internet accesses, one is static (i have the ip, subnet and gateway) and the other one is just dynamic. I want to use the static one to access my files from the internet, and the other one for everything else (that is accessing internet from home of course). The main reason is, my static internet is much slower than the dynamic one. I connected the static to the ether1 interface and set up the ip settings, working just fine, the cable for the dynamic is connected to the ether2 interface, all the devices like computer and notebook are connected to a switch, which is connected to the ether3 of the mikrotik router. I want every request coming from the ether3 goes to the ether2, so it will use the connected dynamic internet connection. Is this approach right or is my imagination totally wrong? Can someone direct me in the right direction? Thanks in advance.

What type of dynamic connection is it? Cable, fibre, dsl??

It’s an IPTV and internet combo. There is a router, which is inaccessible (admin password protected) and has ethernet ports, two are for IPTVs and 2 are for the internet. Of course it’s a DHCP enabled router so the devices connected to it must get the IP automatically.

It sounds like you really have two static IPs then because the ISPs router will always dishout the same LANIP (your WANIP) to your router. I am not sure why they provide two ethernet outputs as there is no increase in throughput/bw?? I suppose it may be useful for some reason testing the modem router directly??

I would restart the router from defaults and go step by step.
In other words connect your STATIC IP ISP first using the default settings of the MT.
Ensure you have connectivity.
Download and start using WINBOX
Explore the settings in place.
++++++++++++++++++++++++++++++++++++++

Eventually you want to manually replace everything you see with your own settings.
This will help you learn what those router settings were doing (allowed you to attach a LAN and access the internet safely).
Very little if anything is done ‘automatically’ as one needs to program all the traffic flows in the router.

Once you have manually replaced all the settings for ONE connection (and have some understanding of what you have accomplished), then and only then would I introduce the next ISP.

Thanks bro, reading someones reply already relieves my stress about the setup. Even though yours isn’t an instruction i can immediately follow, it’s helpful already. I will play around with them a while and report back, if i manage to accomplish what i wanted.

No worries, every mistake you have made or will make, Ive been there. I am not like the rest of the experts in the forum, I am a faux guru LOL.

Cheers