For example, I only bet on Manchester City every week until the end of the season with the assumption that Manchester City are able to finish the Premier League and enter the top 4 of the standing.
I am with you on this one, single bets are definitely less risky than multi bets. The easiest way to look at risk in my opinion is to look at returns. You will always find that single bets offer lower returns compared to multi bets. Personally I prefer lower returns as long as my risk of losing my money is lower too. I would recommend to stick to more bets and single bets, instead of a few high risk multi bets with a nice payout.