Sometimes all you need is to get good windows into your home. I know that the new window profiles don't have such problems as drafts, they are made energy efficient so that they keep heat longer. I know that usually new windows and their installation are very expensive, but there are companies that offer their customers high-quality, modern product and don't require a lot of money for this, for example, like this one https://crystaliaglass.com/ . I think you can discuss the prices for their services and metal-plastic packages for windows in detail with their manager, and I'm sure that he will be able to offer you good option that will completely save you from the problems that you have now because of the old window. I have changed the windows in my apartment several times because it really helps me save money on my electricity bills becouse of heating my appartment.