4G and 5G are different, Mikrotik has not (yet) AFAIK many “bleeding fast” 5G capable outdoor devices, there are people that use Chateau 5G Ax (which has LTE cat20 and 5G modem) inside electrical boxes (and it is not cheap, list 595$)…
If you have very low signal, then probably the best is currently (but no 5G):
https://mikrotik.com/product/lhg_lte18
See also this recent thread:
http://forum.mikrotik.com/t/5g-for-home-network/176916/1