Try creating multiple ads and test all of them to see which one converts the best. Increase your daily / monthly budget. Spread to different traffic networks.

other suggestion please

Theres really not much more to it. Keep testing Keywords to see what performs well, keep testing different adverts (split testing) to see which converts best. Keep testing your landing page to see which converts best. Apart from that, thats all is to it.

suggestion please

Have you raised your daily budget and set your campaign settings to advanced delivery? The the first step to scaling.