Hi Eduardo Menezes , Also make attention on the "scaffold-hopping" strategy. Although Scaffold-hopping is most commonly a medicinal chemistry method, it is an important drug-design strategy that could be used to develop novel leading compounds with potent activity, where a major point is a molecular backbone replacements with a more pharamacophore substituents, fragments or rings.
Try fragment based drug design approach and pin point the additive/beneficial changes to the pharmacophore and its structural/sub-structural parts you developed.
Hi Eduardo Menezes , you can definitely go for structure based pharmacophore modelling strategy, which will help you to analyze the protein binding site and to modify the compound more precisely and accurately.