That's amazing, for 5 years so at a minimum that's around $5200 and with the price increases over the years it can be worth way more.

I would just caution you every time you move Bitcoin to cold storage you create a new UTXO so in your case you would have 260 UTXO transfers, that means if you are ever to move your BTC as an entire sum back to an exchange to sell, it's going to cost you a lot in fees because you're moving 260 separate BTC as 1.

I am also a not your keys not your crypto kind of person but I do recommend efficiency of UTXO's. One way you can get around it is to have a lightning wallet instead and top that up every week and then at the end of the year move it into cold storage as one on chain UTXO it will save you a lot of money in the future