Could you recommend a product that is better than flourish? Or can i usr another product by seachem such as trace or advanced in addition?
You want a comprehensive (complete) fertilizer, meaning one that has all ingredients in the proportions needed by the plants. However, some of the 17 required nutrients occur naturally in the aquarium and should not/will not be included in fertilizers; these are oxygen, hydrogen and carbon.
Of the remaining 14, some are macro-nutrients and some are micro-nutrients. All of these are included in a few products. Seachem's Flourish Comprehensive Supplement for the Planted Aquarium, Brightwell Aquatics' FlorinMulti, and TNC Lite (this latter is available in the UK, perhaps not in Kuwait). If you can get the Flourish, it is good, but do not get the other individual nutrients, just the Comprehensive and the Flourish Tabs. It is true that calcium and magnesium are in limited quantity in these, but this may not be an issue depending upon your plants. I have had thriving planted tanks for years using this liquid (and the Flourish Tabs for larger rooted plants) and I have zero GH. You should pin down the GH of your water supply, it may be more than sufficient.
Photos of three of my tanks may illustrate. The first was my 5-foot 115g, the second the 70g before fish were added (plants came from other tanks), and the third the 40g now.