You can’t arbitrage anymore in 2023, you could in 2015 if you had some decent programming skills but in 2023 you are up against many fast bots and firms which have tons and tons of money and experience compared to you.

Sometimes you might get lucky with some low liquidity coin or on some dex, but you will be working for peanuts pretty much. This is no different than arbitrating on stocks. Same thing. Most professionals do it and there if no arb left for you.