Should I use a higher dose of the medication Oekolp?

Please tell me, can the effect of Oekolp 0.03 ovule weaken with long-term use? I use the maintenance dose (three times a week) for about a year, without a break, before that I also used courses, for several months, incl. long-term, more than 8 months. I began to notice that there was no effect from the drug. Maybe the dose is too small and you need to switch to Oekolp forte? Age 58 years, menopause 8 years