When apologizing to your girlfriend, the most important thing is to be sincere and let her feel your sincerity. The real solution to problems and conflicts is not what kind of gift you give, but to communicate well with your girlfriend and show your sincerity. Of course, giving a gift will help to ask for your girlfriend's forgiveness, and it may have unexpected results. Here are a few small gifts for you:
DIY chocolate, you must have given chocolate as a gift, but the chocolate I recommend to you here is very different from the usual ones. It is handmade with chocolate imported from Spain, with various shapes and colors, and most importantly, you can write what you want to say on it, with your apology or blessings written on it, which is absolutely novel.