I earn 350$ per month from my mining rig only and I've not make back my initial investment yet, I have more interest in adding more GPU as possible instead of taking the profits for nothing sake since I don't need money for now.
First off this is a marathon or better yet a triathlon..
Ie five year window or more.
Second if you are clearing 350 month in three months you have 1050 to send back.
My suggestion is hold coin+cash in a 50-50 ratio.
525 in coin and 525 in cash.
When three months are up decide to get a gpu or not.
Lastly what is you two year or three year plan?
Can you build out to 50 cards?
There is a max amount for location.
My garage has three 240 volt circuits it can do 70 amps about 17kwatts.
but it would be too hot if I ran that much gear unless it is the dead of winter and around 0 c or less.
So I run 2 or 3 kwatts in the summer and 6 or 7 in the winter.
1 kwatt is about 3 rtx 3090 or 8 rtx a4000
2 kwatt is about 6 rtx 3090 or 16 rtx a4000
so can you do 1 or 2 or 3 or 4 or 5 kwatts
and how many are you doing now 1 or 2
do some math. you do 1 kwatt and want to grow to 2 kwatt
this means you can space your growth over 1 year maybe a card every three months.