Script - Find paragrapf style and change with apply my style then next style

You can tweek it to suit your needs better:

app.doScript(Main, language=ScriptLanguage.JAVASCRIPT, withArguments=[], 
    undoMode=UndoModes.ENTIRE_SCRIPT, undoName='Testing');

function Main(){
    //reference to each style
    const titleStyle = app.activeDocument.paragraphStyles.itemByName('Title')
    const textStyle1 = app.activeDocument.paragraphStyles.itemByName('Text1')
    const textStyle2 = app.activeDocument.paragraphStyles.itemByName('Text2')
    const textStyle3 = app.activeDocument.paragraphStyles.itemByName('Text3')

    //selected paragraphs (including first title)
    var paras = app.selection[0].paragraphs;
    var prevstyle = paras[0].appliedParagraphStyle;
    
    for (i=1; i<paras.length; i++){
        var para = paras[i];
        var curstyle = para.appliedParagraphStyle;
        
        //ignore titles
        if (curstyle==titleStyle){
            continue;
        }

        //apply new style
        if (prevstyle==titleStyle){
            para.applyParagraphStyle(textStyle1);
        }
        else if (prevstyle==textStyle1){
            para.applyParagraphStyle(textStyle2);
        }
        else if (prevstyle==textStyle2){
            para.applyParagraphStyle(textStyle3);
        }
        else if (prevstyle==textStyle3){
            para.applyParagraphStyle(textStyle2);
        }

        //update prev
        prevstyle = para.appliedParagraphStyle;
    }
}