Hello Michele. You can’t use 和 that way, to connect sentences. That is a noun connector, first and foremost. Cross out the 和 and just use a comma instead. Don’t you mean 果汁, juice, as in drinking juice? Study hard! You can do it!

As explained below, 2 is off. The 1st sentence sounds really strange. Didn’t you mean to use 曾经看过？If they didn’t see the game in the first clause, how had they already seen it in the second clause? Maybe 曾经 is what you’re looking for. They didn’t watch the game because they had already seen it before (could have even been 10 years ago, 曾经 is more distant.

The meaning is the same. With the addition of “I think”, you’re just changing the tone, softening it and seeming a bit more friendly. Like what you do with ...方がいい, a friendly advice. I hope this helps. Keep at it, you can do it!

I’d say your best bet is to either get a dialect coach or if you’re looking to save money at the expense of a larger time investment, try some techniques yourself. One of those is shadowing: pick a dialect you like, select s bunch of content with it, watch a segment and try to emulate it right after. Really try to replicate a person’s accent. You can try with stronger/clearer/funnier ones and as you progress, go for the realer/more nuanced ones. Good luck with your studies and practice. If you need help, feel free to ask. You can do it!