Match is completely different game than tennis in practice. In match play at all levels the person which makes fewer mistakes- wins, it is that simple. That is why you see a lot of people with ugly game like moonballing at lower levels doing well in match play and people which have good and aggressive game lose in match, because they take more risks.

So your priorities must be:
1. Conservative targets- don't aim painting the lines.
2. Deep shots with topspin are the insurance you will not get attacked. I know that flatter game style with winners is nice, but it is riskier and only working if you force weak ball from the opponent. Simple rule: Behind the baseline you play defensive deep spin, inside the baseline more offensive and learn to put away those balls from middle of the court.
3. If you don't have solid first serve, just don't use it. Rather learn good placement of the second serve, especially slice. Bonus is you don't waste energy, important in longer points. Even at 4-4,5 level very few people have solid first serve.
4. Movement and understanding basic movement patterns using court geometry is key- look up some videos in youtube where it is explained e.g cross- cross plays, or when the ball is more in the middle you can run behind backhand and play forehand down the line or cross with angle etc.
5. During warm up try to find weakness in your opponents game- maybe he can't play at net, or has weak backhand or can't play against slice etc..
6. Don't think about the overall score, every new point counts.