Hi. Yes if she doesn’t increase time you’d need to apply to vary in future. It’s best to wait at least 10 months to a year though, and during that time, build up evidence of your polite, reasonable message requests and discussions and her refusals or non responses. It’s important that any messages you send are child focused and with a polite/friendly tone. As they will count in your favour. So rather than just saying “I’d like to have a full weekend now please”. You’d say something like “Jimmy is doing great at football and his reading and writing is coming along - I’ve been playing various games either him with words and numbers as well. He is very happy generally and am requesting we increase his time with me now, from Saturday 5pm to Sunday 5pm weekly to include Wednesday from school to Thursday school drop off, and then after three months, change the weekends to alternate weekends Friday from school to Sunday 5pm. Please can you let me know if this is agreed.”
Sorry if you haven’t been getting many responses. There are plenty on other threads.