What is "kinda new with this MGUS" is likely to be seen differently by different people.
My own haematologist/oncologist saw me for 5 years before he cut it back to annual visits. The bloods are still done semi-annually.

As for your hand pain, if you're not already on anti-coagulants some people take a supplement called Bromelain for joint pain (me included), and it seems to work like magic within a couple of hours., but do not try it without making sure it is OK with your medical team.

It was suggested to me by an eye specialist for something completely unrelated, but he did say the main reason people use it is for joint pain.