What can be the most efficient way to do a submarine swap for amounts between 300usd?

Context: I buy some sats weekly in a Telegram chat using LN, as exchanges in my country abuse withdrawal fees and refrain from implementing LN. I could use binance to withdraw on LN, but for that, better prefer p2p and no KYC Telegram ChatBot. Then, I want to send it all to my on-chain wallet when I reach around 300usd.

I recently did a submarine swap via Boltz on lnbitsWallet to send MY sats on the Lightning Network to my on-chain wallet. I was experimenting, so I sent 120usd for, when mempool fees were at 25sat/vB for immediate.

Using 26 sat/vB the final result was around 7usd commission. Then I sent my total amount for about 12usd in commissions to move 300usd.

I'm aware that it's not much to cry about it, and I know, it's totally worth it to have my sats in a safe place, but I can only afford to buy 25~30usd per week, so I'm wondering: are there more efficient methods, talking about commissions, regardless of the state of the mempool? Like some other wallet or "bridge" that consume less fees?

TY VM!