It is not a good way to start targetting some GEO and then look for affiliate programs.
UK is completely useless, because everyone will rob you to limit 0, unless you persuade bet365 (good luck with that).
US is quite bad for future, because you will be forced to promote either legal or offshore bookies.
The legal ones are useless because you will need a licence for each state, they pay very low commissions usually CPA and those who pay RS (where you will probably need even more compliacted and expensive licence) will rob you as well, because they are the companies who stole elsewhere or already at US market (like Fanduel or Draftkings).
The offshore are still fine, they pay good money but no one knows for how long. Also the ones from UK will likely demand that even in the US you promote the legal ones.
So the market for your traffic is not perspective. And even if all goes well you will collect just percents of what it used to be.
If you talk to God, you are praying; If God talks to you, you have schizophrenia.